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Photothermal heating curves of (A) bare BP and (B) Zn-BP-P-Apt/D dispersed in air-exposed water for 0, 1, 3, and 6 days. The 808nm laser was used as the irradiation source at the power density of 1 W cm–2. Optical images of bare BP on Si/SiO2 after exposure to the humid air at room temperature for (C) 0 and (D) 48 h, images of bare Zn-BP after (E) 0 and (F) 48 h (Scale bar = 10 μm).
